Method and device for recreation of an analog luminance signal f

Details Method and device for recreation of an analog luminance signal f Method and device for recreation of an analog luminance signal f

1982-05-07

1987-06-02

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358138, H04N 140

Patent

active

046707921

ABSTRACT:
The present invention concerns a process for the recreation of an analog luminance signal from a digital signal used for transmission after analog digital conversion of a luminance signal representative of a document to be transmitted, consisting in taking into consideration, before or after the D-A conversion of the reception, a number P of successive pixels P-2, P-1, P, P+1, p+2 and, as a function of their relative and absolute amplitudes, in processing the central pixel P, breaking it down into m sub-pixels having densities that are a function of those of the surrounding pixels. The present invention notably applies to the digital transmission of iconographic documents transmitted and received by a method of the "Belin" type.

REFERENCES:
patent: 4280144 (1981-07-01), Bacon
patent: 4349846 (1982-09-01), Sekigawa
patent: 4366506 (1982-12-01), Ejiri
patent: 4389677 (1983-06-01), Rushby
patent: 4402015 (1983-08-01), Yamada
patent: 4402016 (1983-08-01), Muller

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